Andrea (Giorgio Pasotti) is a wealthy young Swiss financier who, one night at a concert, is struck by the stirring beauty of a pianist named Antonia (THE HEART ELSEWHERE's Vanessa Incontrada) and immediately decides he'll marry her. The years pass, three children are born and as the passion wanes, their marriage turns into a routine. Then Antonia, who gave up her artistic life for Andrea, meets a talented violinist Daniel (Andoni Gracia) and takes up her piano playing again. For Andrea this sudden change will mean his greatest fears are coming true - that his wife will no longer belong to him, that his wife is cheating on him...

Maurizio Sciarra (OFF TO THE REVOLUTION IN A 2CV) delivers a compelling noir-drama about what would drive a man to kill his wife, based on the Leo Tolstoy novella "The Kreutzer Sonata" but set in present-day Lugano, Switzerland. WHAT IS LOVE? is fascinating in its breadth & scope about marriage, compatibility, jealousy and matters of the heart, yet directed and shot with wonderful economy. Pasotti, so memorable in AFTER MIDNIGHT, is magnificent - his extraordinarily subtle and powerful performance gives the film its beating heart.